<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>math</title>
</head>
<body>
	<script type="text/javascript">
	// document.write(Math.abs(-15)+'<br>');//绝对值
	// document.write(Math.round(3.7415)+'<br>');//四舍五入
	// document.write(Math.floor(9.99)+'<br>');//向下去约数
	// document.write(Math.ceil(3.1415)+'<br>');//向上取约数
	// document.write(Math.round(Math.random()*15+1));//取随机数1-15;

	//随机点名
	var aa=['唐超','周鹏宇','范圆圆','刘维','唐凌宝']
	document.write(aa[Math.round(Math.random()*4)])

	






	</script>
</body>

</html>